The Long Now Foundation was established in 1996 to develop projects that creatively foster long-term thinking. One of these projects, the 10,000 Year Library, explores what a library for the ages might be, and how such a library might survive to serve as a repository of human knowledge and civilization for millennia to come.
The Rosetta Project is one exploration of The Long Now Foundation’s 10,000 Year Library. The Rosetta Disk, a very long-term backup of the collection, is a hand-sized nickel disk microscopically etched with thousands of pages from the collection and readable with 600 power optical magnification. The writing on the disk can last and be legible for thousands of years.
The Long Now Foundation website has more information on the 10,000 Year Library